Shake Shack's 'Shroom Burger

June 3, 2017

Test Kitchen-Approved

Author Notes: It wasn't until I tried the Shake Shack's 'Shroom Burger that I realized veggie burgers needn't be sensible. Why coax vegetables (and, for most recipes, grains and binders and starches, too) into the shape of a patty? Vegetarian burgers can be entirely nonsensical and untraditional and just as messily delicious as any meat burger on the menu.

The 'Shroom Burger forgoes the constraints of the patty form to present a mushroom in its most dignified state—breaded, fried, full of cheese. It's insanity! When you eat the sandwich, you work your way through the roasted mushroom barrier to hit the cheese geyser at its center.

And you needn't purchase a specialty cheese syringe (oh yes, these exist) to make them. Simply roast the mushrooms, slice them in half through their bellies, then hide a ball of the filling—a mixture of grated cheese, onion, garlic, flour, egg yolk, and cayenne—in between the top and bottom. Coat the reconfigured mushrooms in flour, beaten eggs, and panko, then get them into the hot oil.

Reprinted from Shake Shack. Copyright © 2017 by Shake Shack Enterprises, LLC. Published by Clarkson Potter/Publishers, an imprint of Penguin Random House, LLC.
Sarah Jampel

Makes: 4
Prep time: 30 min
Cook time: 1 hrs

Ingredients

For the mushroom caps and filling:

  • 4 4-inch portobello mushroom caps
  • 1/4 cup canola oil, plus more for deep-frying
  • 1/2 teaspoon kosher salt
  • 1/8 teaspoon freshly ground black pepper
  • 1 1/2 cups plus 1/4 teaspoon flour, divided
  • 3 eggs plus 1 egg yolk, divided
  • 2 cups panko breadcrumbs
  • 1 1/2 cups grated Muenster
  • 1/2 cup grated cheddar
  • 1/2 teaspoon minced onion
  • 1/8 teaspoon minced garlic
  • 1 dash Kosher salt
  • 4 tablespoons ShackSauce (below)
  • 4 hamburger potato buns, toasted
  • 4 pieces green leaf lettuce
  • 8 1/4-inch slices ripe plum tomatoes

For the ShackSauce:

  • 1/2 cup Hellman's mayonnaise
  • 1 tablespoon Dijon mustard
  • 3/4 teaspoon Heinz ketchup
  • 1/4 teaspoon kosher dill pickling brine
  • 1 pinch cayenne pepper
In This Recipe

Directions

For the mushroom caps and filling:

  1. For the mushroom caps, preheat the oven to 375° F. Put mushroom caps on a medium baking pan. Rub caps all over with 1/4 cup of canola oil, then season both sides with the salt and pepper. Arrange mushrooms gill side down in a single layer and roast until tender, 30 to 35 minutes. Remove from the oven and set aside to cool. Slice mushrooms in half horizontally (through their bellies, like you're slicing a hamburger bun).
  2. Put the 1 1/2 cups flour in a wide dish, beat 3 eggs in another wide dish, and put the panko in a third wide dish and set aside.
  3. For the filling, mix together the Muenster and cheddar cheeses, onion, garlic, remaining 1/4 teaspoon flour, remaining egg yolk, and cayenne pepper in a medium mixing bowl. Set aside.
  4. Shape the filling into 4 equal disks, 1/2 inch smaller in diameter than the mushroom caps. Place cheese disks on gill side of each mushroom cap, cover with other half of cap, cut side down, and gently press together to secure the filling.
  5. Dredge the stuffed mushroom caps in the flour, then dip in the beaten egg, coating them completely, then dredge in the panko. Set prepared mushrooms on a plate and refrigerate while heating the oil to deep-fry them.
  6. To cook the mushroom burgers, pour the oil into a deep, wide pot to a depth of 3 inches. Heat over medium heat until the oil reaches a temperature of 350° F on a candy thermometer. Deep-fry the prepared mushrooms, one or two at a time, until golden brown and crisp all over, about 3 or 4 minutes. Transfer mushrooms with a slotted spoon to drain on paper towels. Season with salt.
  7. Spoon the ShackSauce onto the top bun. Add a piece of lettuce and two slices of tomato. Transfer the mushroom burgers to the prepared buns. Enjoy!

For the ShackSauce:

  1. Whisk together all ingredients to combine.

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Reviews (7) Questions (0)

7 Reviews

Ellis D. August 8, 2018
I absolutely loved it. I just wanted to say that some mushrooms will not be able to cut the cap. If you refrigerate the cheese mix (cheesy goodness) it will not crumble nor make a mess. I will try to bake it next time, bc it's too oily .
 
louisez February 18, 2018
Big oops. What I meant to ask if these can be baked. Sorry for the typo. Want to make these for someone for whom oil/frying is a problem. Thanks!
 
Teresa G. February 20, 2018
I have both baked and air-fried these for a healthier option and they tasted great! My three boys ate them up and asked for more!
 
louisez January 17, 2018
Can these be naked instead of fried?
 
Keith January 10, 2018
Remove the gills from the caps, or no? My first attempt was with gills removed and the caps shriveled so much during roasting I couldn't slice them. Ended up combining 2 caps with filling in between.
 
Ellis D. August 8, 2018
I only removed the stem not the gills. And I saved the juices for next soup or rice.
 
Teresa G. June 26, 2017
Made this for my family tonight and even our young sons tore them up! We love anything Shake Shack, but these were a definite hit! Thanks! :)